Improvement in padlocks



UNITED STATES PATENT OFFICEa HERMANN AHREND, or NEWARK, NEw JERSEY,AssiGNoR To RoMER a oo., or sAME PLAGE.

IMPROVEMENT IN PADLOCKS.

Specification forming part of Letters Patent No. 156,113, dated October20, 1874; application iiled June 3, 1874.

GAsE 0.

To all whom it may concern:

Be it known that I, HERMANN AEREND, of Newark, in the county of Essexand State ot' New Jersey, have invented certain new and usefulImprovements in Locks; and I do hereby declare that the following is afull, clear, and exact description thereof, which will enable othersskilled in the art to which it pertains to make and use the same,reference being had to the accompanying drawings, and to the letters ofreference marked thereon, which form a part of this specication.

My invention relates to that class of locks in which a U-shaped bail orhasp is held by means of a series of tumblers placed upon a centralkeybarrel, and entering notches in the two arms of the hasp; and thenature of my invention consists in the use of a spring extending alongone of the ribs of the lock, and bearing against the edges of all thetumblers which have a notch on outside, by which means the tumblers areprevented from being accidentally displaced, all as hereinafter morefully set forth.

In the accompanying drawing, Figure l is a side view of a lock embodyingmy invention. Fig. 2 is a longitudinal section, and Fig. 3 a transversesection, of the same. Fig. 4 is a bottom view of the lock. Fig. 5 is aninterior view of the lock with the working parts removed. Fig. 6 is asimilar View with all the parts in position. Fig. 7 is another interiorView, with the spring-plate that holds the tumblers against the top ofthe lock removed. Fig. 8 shows the tumblers; Fig. 9, the plates betweenthe tumblers; and Fig. 10, the key.

A represents the lock-case, and B is the U- shaped hasp or shackle, thearms of which are notched at regular intervals on their inner ends, asshown in Fig. 2. C represents the central key-barrel, for the passageot' the flat key D, which key 'is constructed substantially in themanner shown in Fig. 10. Around the barrel C are placed a series ofcircular tumblers, E E, and between said tumblers are placed plates G G.These plates are held in place by having notches in their ends tttin gover interior ribs c c in the sides of the case A. All the tumblers andplates are held up against the top of the case by means of aspring-plate, H, which rests upon the bottom plate I of the lock. Eachtumbler is provided with additional slots, so as to form points w and y,in addition to the point z, that the key of the lock will take against.The slot forming the point is made so that a key being inserted, inwhich the corresponding ward is a triile longer than it ought to be, itwill catch on said point, and thus turn the tumbler out of its place. Inlike manner the point y will be caught by the ward being even a trifletoo small. Each tumbler has, of course, curved notches b on oppositesides for the passage of the arms ot' the shackle when unlocking thelock. When the tumblers are in the locked position they are held by aspring or springbar, d, inserted along one of the ribs a, in notches t',formed in the edge oi' the tumblers. This spring does not prevent thetumblers from being turned by the key, but prevents simply anyaccidental movement of them while the lock is locked. One of the arms ofthe shackle B is made longer than the other, and in or through the endthereof is passed a pin or cross-bar, h, which, when the lock isunlocked, and the shackle withdrawn, enters a circular recess, f, in theupper part of the lock, thereby keeping the shackle connected with thelock when open.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is

The spring d, plates G, tumblers E, with notches z, and ribs a, thespring d extending the entire length of one of the ribs, and bearingagainst the same, and also against the tumblers, holding the latter inposition to prevent their being accidentally displaced, as and vfor thepurpose set forth.

In testimony that I claim the foregoing as my own I affix my signaturein presence of two witnesses.

HERMANN AHREND.

Witnesses ABRAHAM MANNERs, It. J D. DUNN.

